alpha 1 beta 1 Integrin-Mediated Adhesion Inhibits Macrophage Exit from a Peripheral Inflammatory Lesion

作者：Becker Henry M^*; Rullo Jacob; Chen Mian; Ghazarian Magar; Bak Sungho; Xiao Haiyan; Hay John B; Cybulsky Myron I

来源：The Journal of Immunology, 2013, 190(8): 4305-4314.

DOI：10.4049/jimmunol.1202097

Integrins are adhesion molecules critical for the recruitment of leukocytes from blood into peripheral tissues. However, whether integrins are also involved in leukocyte exit from peripheral tissues via afferent lymphatics to the draining lymph node remains poorly understood. In this article, we show that adhesion by the collagen IV-binding integrin alpha 1 beta 1 unexpectedly inhibited macrophage exit from inflamed skin. We monitored macrophages exiting mouse footpads using a newly developed in situ pulse labeling technique. Blockade of alpha 1 beta 1 integrin or genetic deletion (Itga1(-/-)) increased macrophage exit efficiency. Chemotaxis assays through collagen IV showed more efficient migration of Itga1(-/-) macrophages relative to wild type. Given that macrophages are key orchestrators of inflammation, alpha 1 beta 1 integrin adhesion may represent a mechanism for regulating inflammatory responses by controlling macrophage exit or persistence in inflamed tissues. The Journal of Immunology, 2013, 190: 4305-4314.

• 出版日期2013-4-15